Ore-grinding machine



'1} L March 1927' G. w. MORTHLAND 620 276 ORE GRINDING MACHINE Filed May10. 1921 4 Sheets-Sheet 1 WITNESSES 2. nymyrofi anrMonMa-nd a O @014 (mgQ 28 v 19 7. March 2 G. w. MORTHLAND ORE GRINDING MACHINE Filed May 10,1921 4 Sheets-Sheet 2 III! i $5 4 T TORIVE Y8 M h 8 1927. are c. w.MORTHLAND ORE GRINDING MACHINE Filed May 10 1921 4 Sheets-Sheet'iS w awm0 m G 1 3 WITNESSES @gawa March 8 1927. 1,620,276

G. w. MORTHLAND ORE GRINDING MACHINE Fi led May 10. 1921 I 4Sheets-Sheet 4 mum/Ton G. "(Mar/51am A ITORNEYS Patented Mar. 8, 1927.

UNITED STATES GEORGE W. MORTHLAND, OF LEAD, SOUTH DAKOTA.

ORE-GRINDING MACHINE.

Application filed May 10, 1921.

This invention relates to improvements in ore grinding machines of thetube mill type.

An in'iportant object of this invention is to provide an ore grindingmachine of the character described which is supported for rotation atone end by means of pairs of swingingly supported rollers engaged with atire 01' hand surrounding the casing in such a manner that wear on thetire is reduced to a minimum.

A further object of the invention is to provide an ore grinding machinehaving a :asing which is interiorly enlarged toward its ends so as topermit the oreupon being crushed to gravitate freely toward thedischarge end of the mill and so as to prevent accumulation of thelarger and uncrushed material at the head of the mill.

Further by gradually and uniformly enlarging the mill toward its ends amore uniform sizing and shifting out of the finished products issecured.

The invention forming the subject matter of this application furtherresides in the formation of the crusher rings as will be more fullyhereinafter pointed out.

Other objects and advantages of the invention will be apparent duringthe course of the following description.

In the accompanying drawings forming a part of this application and inwhich like numerals are employed to designate like parts throughout thesame,

Figure 1 is a vertical sectional view through the improved ore grindingmachine.

Figure 2 is a detail sectional view of the rotating ring of the mill.

Figure 3 is a vertical transverse sectional view through the improvedore grinding machine.

Figure 4 is a side elevation of one form of ore crushing ring.

Figure 5 is a transverse sectional view taken on line 4.4@'of Figure 4:.

Figure 6 is a fragmentary side elevation of a further modification ofthe crusher ring.

Figure 7 is a horizontal sectional view taken on line 77 of Figure 6.

Figure 8 is a perspective of one of the crushing shoes detached.

Figure 9 is a side elevation of a still further modified form of orecrushing ring, parts being broken away.

Figure 10 is an edge elevation of the ore crushing ring illustrated inFigure 9.

Serial No. 468,360.

Figure 11 is a vertical'transverse sectional View taken on line 1111 ofFigure 9.

Figure 12 is a perspective of one of the pressure weights embodied inthe form of the invention illustrated in Figures 9 to 11 inclusive.

Figure 13 is a side elevation of a still further modified form of orecrushing ring, parts being shown in section.

Figure 141 is a detail transverse sectional view taken on line 14-44 ofFigure 13.

Figure 15 is a perspective of an ore crushing shoe illustrated in Figure13.

Figure 16 is a group perspectve of a key or fastening device embodied inthe inven-' tion.

Figure 17 is a fragmentary side elevation through a further modificationof the crushing roller.

Figure 18 is a fragmentary edge elevation of the crushing memberillustrated in Figure 17.

In the drawings wherein for the purpose of iliustration is shown severalpreferred embodiments of the invention, the numeral 20 generallydesignates a casing having end walls 21 and 22 in the form of disks. Theend walls 21 and 22 may correspond to the construction of the end wallshown in my UnitedStates Patent 1,363,999 and are provided with tubulartrunnions 24 and 25 through which a quantity of liquid is supplied. Theore upon being crushed within the casing is of course, carried offthrough the outlet trunnion 25 and is subsequently separated from theliquid in any desired manner. The end plates 21 and 22 are secured tothe casing by means of retaining rings 26 which as illustrated in Figure1 have flanges contacting with the end plates andsurrounding and securedto the casing.

The radially projecting flanges of the retaining rings 26 may be securedto the edge portions of the end plates 21 and 22 by rivets or othersuitable means.

A ring gear 27 is arranged about one end of the casing and is providedwith an inwardly directed attaching flange 28 secured to the retainingring 26 by means of the rivets which connect the retaining ring 26 tothe end plate 22. The ring gear 27 is engagedby a beveled gear operatedfrom any suitable source of power.

The casing is provided adjacent its other .end with a rim 30 about whicha metallic tire 31 is arranged and which is mounted upon pairs ofrollers 32. lNith reference to Figure 3 it will be observed that therollers 32 which are arranged in pairs are provided with laterallyprojecting pins 33 connected to the sides of cradles 34 into which therollers 32 extend. Each cradle 34 is connected intermediate its ends ata point adjacent its lower end or side with a pair of upstandingapertured ears 35 by means of trunnions 36. The cars 35 which arearranged on opposite sides of the cradles are of course provided withconnecting plates mounted upon the base plates 37 and each having oneend formed with an upstanding lug 38 which limits the sliding movementof the ears 35. The base plates 37, of which there are two, are securedon inclined supports 39 arranged on opposite sides of the verticalcente' ot' the casing. lVedges 40 are arranged between ears 35 and thebase plates 37 and are forced beneath the ears 35 by means of set screws41 having threaded engagement with the upstanding ears 4:2 formed at theupper ends of the base plates 3'7. By tightening the set screws 41 thewedges 40 may be forced beneath the supporting members 45 so that thecradles 34 will'be elevated. As the rollers 32 may partake 01 a slightmovement about the axis of each pair of trunnions 36 wear onthe tire 31and on the rollers is reduced to a minimum. Further, the specificsupporting means employed for the casing permits shocks incident to theoperation of the crushing disks to be absorbed without undue strain onthe machine.

As illustrated in Figure l, a lining of con-- crete 44 is arrangedwithin the casing as is a lining 45 of hard iron or the like. The lining45 has its internal diameter decreased gradually and uniformly towardthe center of the casing so as to form what might be termed the rim atthe center of the casing over which the bore passes when properlyground. The internal diameter of the easing is decreased toward itscenter or inter mediate portion by decreasing the thickness of theconcrete lining at the ends of the casing.

In my United States Patent #1366399 the casing was gradually reducedtoward its discharge end so that the ore upon being crushed was forcedto ascend rather than descend wit-h the result that the larger particlesof ore accumulated at the head of the machine. However, in accordancewith the present invention the ore upon being properly crushed ispermitted to freely gravitate toward the discharge end of the mill,since the mill is gradually and uniformly enlarged toward its dischargeend.

However, since the mill is gradually de creased in its internal diameterfrom its in let end, the larger particles of ore are re tained withinthe enlarged end of the casing until ground by the action of thecrushing members. By gradually increasing the internal diameter of thecasing toward its ends, the accumulation of the heavier particles of oreat the head of the machine is prevented and more uniform sizing andsifting out of the finished product as adapted to the stream flowingthrough the mill is admitted.

A plurality of rotary crushing elements are arranged within the casingand have their opposed sides in contact so that as the casing is rotatedby means of the ring gear 2? and the source of power connected to thesame the ore will be engaged by the several crushing members upon movingoutwardly and crushed or partially crushed to the desired fineness. Theseveral crushing disks may decrease in thickness toward the dis chargeend of the mill so as to cause the disks to rotate with relation to eachother whereby the ore positioned between the disks will be pulverizedwhen the machine rotates.

The crushing members may be of the type ilustrated in Figures 4 and 5wherein the disk is designated by the numeral 47 and is provided with aplurality of grooves 48 which extend obliquely with relation to theradius of the disk and out through the edges of the same to permit ofthe passage and crushing of the ore. As in the case in the aforesaidpatent, the disks rotate with relation to each other and the orereceived within the grooves is crushed by this rotation of the diskswith relation to each other. However, by arranging the grooves 48obliquely with relation to the radius of the disk, the material beingcrushed is not carried so high on the ascending side of the disk as itwould be with radially extending grooves and the material is free topass through the pocket on the descending side of the disks. By reasonof this construction, less power is required to operate the mill and thecrushing capacity of the same is substantially increased.

A plurality of arcuate crushed weights 49 may be engaged with the inneredge of the disk 47 and are provided with radial grooves 50 registeringwith the obliquely extending grooves 48 to permit of passage of the ore.The ends of the arcuate sections 49 are enlarged and are formed withgrooves to receive the wedges 51 which act as a means for holding thesections in their extended positions as indicated in Fig. 4.

In the form of the invention illustrated in Figures 6 to 8 inclusive thecrushing member which is generally designated by the numeral 52 includesa master ring 53 of steel or the like and which is provided with anannular series oi spaced openings 54. An annular series of crushingshoes 55 of approximately segmental formation are formed with slots 56which snugly receive the master ring 53 and which have their edgesformed with spacing shoulders 58. The spacing shoulders-58 act as ameans for spacing the outer portions of the shoes to form pockets inwhich ore is received. The shoulders 58 Which are less in thickness thanthe thickness of the shoes also define radial grooves through which oreis passed when being crushed. The shoes are provided on opposite sidesof the slot 56 with openings 59 aligning with the openings 54 for thereception 01": a key or fastening device generally designated by thenumeral 60. With reference to Figure 8 is will be noted that each shoeis provided with a radially extending slot 61 into which a quantity ofore is tightly packed during the operation of the machine so as toengage the outer edge of the master ring 53 and prevent the loosening ofthe shoe should the key generally designated by the numeral 60 becomeloose. In other words the opening 61 communicates with the transverseslot 56 so that the ore packed within the opening 61 may contactdirectly with the outer edge of the master ring. The opening 61 in theshoe 55 also provides means whereby the shoes which are of steel maybeproperly tempered to withstand the friction incident to use.

The crusher illustrated in Figures 6 to 8 inclusive may be provided withan annular series of arcuate pressure weights 63 having grooves whichreceive the inner edge portions of the master ring and having their endsformed with transverse-grooves for re- 69 are formed with radialopenings, 70 which permit the materialbeing crushed to engage the outeredge of the master r1ng 67-and thereby relieve the strain on thefastening devices 60. Inother words the radial openings 7 0 communicatewith the grooves which receive the master ring67 and thereby permit thematerial packed within the opening to contact directly with the outeredge of themaster ring and to cooperate with the fastening devices inholding the arcuate sections 69 against movement. The ends of thearcuate sections 69 are formed with reduced shoulders 71 which defineradial grooves for the passage of the ore between the disks.

Pressure weights 7 2 of a material cheaper than the shoes 69 arearranged about the inner side of the master ring 67 and are formed withspaced lugs 73 which are received within the spaced notches 74 in theshoes whereby the pressure Weights 72 are held against movement. -Byholding the pressure weights 72 against movement with relation to theshoes 69, the inner ends of the radialgrooves formed by the shoulders 71are never closed. It will be noted with reference to Figure 9 that thearcuate pressure weights 7 2 terminate at the'ends of the shoes69 and donot extend over the inner ends of the grooves whereby thGgICO'VGS areentirely open. The ends of the pressure weights are, however, engagedbyspacin'g wedges 75. The material necessary for the arcuate shoes 69 isconsiderably reduced since the lugs 73 extend for a substantial distanceinto the shoes and thereby take the place of non-wearing parts of theshoes.

In the form of the invention illustrated'in Figures 13 and 14:, themaster ring. or spider 78 is formed with an annular series of radialspokes 79 having their outer ends reduced to form shoulders 80.Substantially segmental shoes 81 are formed with radial openings 81, theinner end portions of which are enlarged to produce the sockets 82 whichreceive the reduced outer ends of the spokes 79 and have their end wallsin contact with the shoulders 80 whereby the shoes'areheld againstendwise movement. Fastening devices 60 are extended through transverseopenings 83 in the shoes and through aligning openings in the outerportions otthe spokes. The spokes 79 have theiropposed edges spaced sothat the shoes 81 are also spaced to define passages for the ore beingcrushed. I

In the form of the invention illustrated in Figures 17 and 18 the masterring is provided with a plurality of recesses 91 into which thelaterally enlarged portions 92 ot the crushing shoes 84 are received toprevent displacement of the crushing shoes when the same wear down tothe outeredge of the master ring 90. The crushing shoes 84 are of courseconnected to the master ring by meansot fastening devices 60.

With reference to Figure 16 it will be noted that each fastening device60 comprises a pair of elongated sections 86 having their outer sidesformed with shoulders 87 which hold the fastening device; againstendwise movement after the application of a tapered wedge designated bythe numeral 88. The fastening device may be constructed of hard wood andupon coming into contact with the water swells somewhat and is morefirmly held in position.

The several types of crushing members are of course arranged within themill and act as a means for thoroughly and uniformly crushing the orepassed through the mill. The operation of the improved mill issubstantially the same as the construction illustrated in my priorpatent with the exception of the advantages derived from the use of theimproved forms of crushing disks and from the use of the specific formof liner.

Particular attention is directed to the showing in Figure 13 wherein theopenings 81 are tapered toward the material collecting ends thereof sothat material received in the openings 81 is firmly packed against theouter portions of the spokes to positively overcome the tendency of theshoes to work loose through wear which will occur without thisprovision. The fact that the openings 81 are tapered toward the outerends thereof allows the material to pack in the openings freely and atthe same time positively prevents the material from squeezing out.

It is also important to note that by making the shoes separate ratherthan solid, the possibility of tempering or annealing is accomplished,giving a more uniform degree of toughness than can be secured by castingthem solid.

Having thus described the invention, what is claimed is 1. A crushingdevice for mills comprising a master ring, crushing shoes havingopenings receiving said ring, said shoes being provided with radialopenings communicating with said first named openings whereby thematerial being ground will be packed within said radial openings andengaged with said ring, and fastening devices for securing said shoes tosaid ring.

2. A crushing device for mills comprising a master ring, crushing shoeshaving grooves receiving the ring and provided with openingscommunicating with said grooves for receiving the material to beoperated on, and means to secure the shoes to the ring.

3. A crushing member for mills comprising a master ring having anannular series of spokes, and shoes detachably connected to said spokes,said shoes being provided with openings adapted to receive material tobe packed in engagement with said spokes.

4;. A free rolling gravity actuated crushing member for mills comprisinga master ring having spokes, the terminal portions of which are taperedto define shoulders, crushing shoes having material collecting openingsreceiving the tapered portions of said spokes, said material collectingopenings being decreased in cross sectional area to ward the materialinlet ends thereof whereby material collected in the openings is firmlypacked in engagement with said ring to hold the shoes against loosening,and means to secure said shoes to the spokes, said shoul ders beingengaged with the shoes.

5. A free rolling gravity actuated crushing member for mills comprisinga ring having an annular series of spokes, separate crushing shoeshaving openings for receiving said spokes, said material collectingopenings being decreased in cross. sectional area toward the materialinlet ends thereof whereby material collected in the openings is packedfirmly in engagement with said spokes to hold the shoes againstloosening on the spokes, said shoes and said spokes being provided withregistering openings, and fastening devices passing through saidregistering openings.

6. A free rolling gravity actuated crushing member for mills comprisinga master ring, and separate crushing shoes having material collectingopenings receiving said ring and being decreased in cross sectional areatoward the material inlet ends thereof, whereby material collected inthe openings is firmly packed in engagement with said ring to hold theshoes against loosening.

7. A free rolling gravity actuated crushing member for mills comprisinga master ring adapted to be rotated at a high speed, separately formedcrushing shoes having material collecting openings extendingtherethrough and receiving said ring, said material collecting openingsbeing gradually decreased in cross sectional area toward the materialinlet ends thereof, whereby material collected in the openings is firmlypacked in engagement with said ring to hold the shoes against loosening,the outer portions of said ring being enclosed in said shoes andprotected thereby, and separate fastening devices cooperating with thematerial collected in said material collecting openings to hold theshoes in place on the ring.

8. A crushing member comprising a body, and shoes carried thereby, andhaving openings extended outwardly from said body whereby the materialoperated on is packed in said openings in engagement with said body tohold the shoes in position.

GEORGE WV. MORTHLAND.

